package net.htjs.mobile.android.crm.util;
import java.io.ByteArrayOutputStream;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import android.content.Context;  
import android.os.Environment;  
public final class FileService   
{  
    private Context context;  
    public FileService(Context context)   
    {  
        this.context = context;  
    }  
      
    /** 
     * 读取文件的内容 
     * @param filename 文件名称 
     * @return 
     * @throws Exception 
     */  
    public String readFile(String filename) throws Exception  
    {  
        //获得输入流  
        FileInputStream inStream = context.openFileInput(filename);  
        //new一个缓冲区  
        byte[] buffer = new byte[1024];  
        int len = 0;  
        //使用ByteArrayOutputStream类来处理输出流  
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
        while( (len = inStream.read(buffer))!= -1)  
        {  
            //写入数据  
            outStream.write(buffer, 0, len);  
        }  
        //得到文件的二进制数据  
        byte[] data = outStream.toByteArray();  
        //关闭流  
        outStream.close();  
        inStream.close();  
        return new String(data);  
    }  
    /** 
     * 以默认私有方式保存文件内容至SDCard中 
     * @param filename  
     * @param content  
     * @throws Exception 
     */  
    public static void saveToSDCard(String filename, String content) throws Exception  
    {  
        //通过getExternalStorageDirectory方法获取SDCard的文件路径  
        File file = new File(Environment.getExternalStorageDirectory(), filename);  
        //获取输出流  
        FileOutputStream outStream = new FileOutputStream(file);  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
      
    /** 
     * 以默认私有方式保存文件内容，存放在手机存储空间中 
     * @param filename  
     * @param content  
     * @throws Exception 
     */  
    public void save(String filename, String content) throws Exception  
    {  
        //  
        FileOutputStream outStream = context.openFileOutput(filename, Context.MODE_PRIVATE);  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
      
    /** 
     * 以追加的方式保存文件内容 
     * @param filename 文件名称 
     * @param content 文件内容 
     * @throws Exception 
     */  
    public void saveAppend(String filename, String content) throws Exception  
    {     
        FileOutputStream outStream = context.openFileOutput(filename, Context.MODE_APPEND);  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
      
    /** 
     * 以允许其他应用从该文件中读取内容的方式保存文件(Context.MODE_WORLD_READABLE) 
     * @param filename 文件名称 
     * @param content 文件内容 
     * @throws Exception 
     */  
    public void saveReadable(String filename, String content) throws Exception  
    {  
        FileOutputStream outStream = context.openFileOutput(filename, Context.MODE_WORLD_READABLE);  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
      
    /** 
     * 以允许其他应用往该文件写入内容的方式保存文件 
     * @param filename 文件名称 
     * @param content 文件内容 
     * @throws Exception 
     */  
    public void saveWriteable(String filename, String content) throws Exception  
    {  
        FileOutputStream outStream = context.openFileOutput(filename, Context.MODE_WORLD_WRITEABLE);  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
      
    /** 
     * 以允许其他应用对该文件读和写的方式保存文件(MODE_WORLD_READABLE与MODE_WORLD_WRITEABLE) 
     * @param filename 文件名称 
     * @param content 文件内容 
     * @throws Exception 
     */  
    public void saveRW(String filename, String content) throws Exception  
    {  
        FileOutputStream outStream = context.openFileOutput(filename,  
                Context.MODE_WORLD_READABLE + Context.MODE_WORLD_WRITEABLE);  
        //Context.MODE_WORLD_READABLE(1) + Context.MODE_WORLD_WRITEABLE(2),其实可用3替代  
        outStream.write(content.getBytes());  
        outStream.close();  
    }  
}  